CMAKE_ROLE
Tells what mode the current running script is in. Could be one of several
values:
- PROJECT
- Running in project mode (processing a CMakeLists.txt file).
- SCRIPT
- Running in -P script mode.
- FIND_PACKAGE
- Running in --find-package mode.
- CTEST
- Running in CTest script mode.
- CPACK
- Running in CPack.